Systemic poly(ADP-ribose) polymerase-1 activation, chronic inflammation, and oxidative stress in COPD patients

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Abstract

Systemic poly(ADP-ribose) polymerase-1 activation, chronic inflammation, and oxidative stress in COPD patients.

Hageman GJ, Larik I, Pennings HJ, Haenen GR, Wouters EF, Bast A.

Department of Health Risk Analysis and Toxicology, Research Institute NUTRIM, University of Maastricht, Maastricht, Netherlands. g.hageman@grat.unimaas.nl

Oxidative stress and systemic inflammation in chronic obstructive pulmonary disease (COPD) strongly suggest a role for the nuclear enzyme poly(ADP-ribose) polymerase-1 (PARP-1, E.C.2.4.2.30) in the disease pathophysiology. PARP-1 is highly activated by reactive oxygen species-induced DNA strand breaks, upon which it forms extensive poly(ADP-ribose) (PAR) polymers from its substrate NAD(+). We hypothesized that in COPD, chronic inflammation and oxidative stress would lead to systemic PARP-1 activation and to a reduced NAD(+) status. In a patient-control study, systemic PARP-1 activation was assessed by immunofluorescent detection of PAR polymers in peripheral blood lymphocytes. The percentage of PAR polymer-positive lymphocytes appeared to be higher in COPD patients (27 +/- 3%) than in healthy age-matched controls (17 +/- 2%, p <.05). Trolox equivalent antioxidant capacity (TEAC) of deproteinized plasma (p <.001), plasma uric acid (p <.05), as well as blood NAD(+) (p <.01) of stable COPD patients were significantly reduced when compared to controls. In addition, levels of proinflammatory cytokines IL-6, IL-8, and sICAM-1 were increased (p <.005) in COPD patients. In this study, evidence was found for the presence of systemic inflammation, chronic oxidative stress, and systemic PARP-1 activation in stable COPD patients. These data support a contribution of oxidative stress-induced PARP-1 activation to the pathophysiology of COPD.

Original languageEnglish
Pages (from-to)140-148
Number of pages9
JournalFree Radical Biology and Medicine
Volume35
Issue number2
DOIs
Publication statusPublished - 1 Jan 2003

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